Samuel t



UNITED STATES PATENT OFFICE;

* SAMUEL T. HARRISON, OF SAN FRANCISCO, CALIFORNIA.

RAS P.

SPECIFICATION forming part of Letters Patent No. 279,750, dated June 19, 1883.

Application filed December 23. 1882. No model.)

To all whom it may concern Be it known that I, SAMUEL 'l.- HARRISON, of San Francisco, in the county of San Francisco and State of California, have invented a new and Improved Rasp, of which the following is a full, clear, and exact description.

The objector" my invention is to provide a new and improved rasp which is 'of simple construction and can be sharpened very easily.

- Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a longitudinal elevation of the rear side of my improved rasp. Fig. 2 is a longitudinal sectional elevation of the same. Fig. 3 is a cross-sectional elevation of the same.

The rasp is made of a thin steel plate or strip, A, and may be flat, half-round, or angular in cross-section, and which is provided at its lower end with a shank, B, adapted to be driven into a handle. By means of some suitable instrument part of the steel plate A is punched out from the back to the front,whereby a series of upwardly-proj ecting and slightly: inclined ridges C will be formed throughout the length of the plate, as shown in Fig. 2. A slot, D, will be formed above eachridge.

The upper projecting edges of the ridges C will be sharp, and if the rasp is passed over Wood, leather, &c., the sharp ridges will remove some of the particles of the leather, wood, &c., in the same manner as they are removed by the teeth of an ordinary rasp. If the ridges or teeth C are dulled, they can easily be sharpened or made effective by punching them out again by means of a suitable instrument. As the ridges are longer than the teeth of an ordinary rasp, my improved rasp will be,

SAMUEL 'IHURSTON HARRISON.

Witnesses:

M. G. DUFFICY, ALF BENNINGTON. 

